60 Medico-Botanical Society.— Royal Institution. 



sometimes, bear a less obvious resemblance to the trap, and 

 from exhibiting transitions from that to the rocks that com- 

 pose the regular strata, are probably the latter more or less 

 changed by contiguity with the trap. 



MEDICO-BOTANICAL SOCIETY OF LONDON. 



April 14. — Sir James M'Grigor delivered an Address to the 

 members of the Society on being elected President. — A com- 

 munication was read on the different species of hellebore used 

 in medicine, and on its use in maniacal cases. 



May 12. — A paper entitled " Remarks on the bitter prin- 

 ciple existing in the fruit of Laurns persea, and its use as a tonic 

 medicine by the natives of Demerara ;" by J. Frost, Esq. F.S.A. 

 and L.S. Director, was read. 



June 9th. — A collection of specimens of the plants enume- 

 rated in the Pharmacopoeia list, was presented by William An- 

 derson, Esq. F.L.S. — Mr. Frost delivered a lecture on the 

 properties of Aconitum Napallus and Conium maculatum, and 

 their narcotic principles. 



July 14. — This being the last meeting of the Society during 

 the present session, was very numerously attended ; and after 

 the ordinary business had been gone through, a paper entitled 

 " A catalogue of the plants indigenous to Switzerland ;" by 

 John P. Yosy, Esq. was read. 



Notice was given from the Chair, that communications for 

 the gold and silver medals should be sent in before the 1st of 

 December. 



The Society then adjourned to the 13th of October. 



ROYAL INSTITUTION OF GREAT BRITAIN. 



May 26. — Dr. Harwood read the second part of his paper 

 containing an account of the African Elephant, and remarks 

 on the structure and senses of elephants in general. These 

 were illustrated by an abundant series of specimens, many of 

 them from the valuable collection of Mr. Brookes, and by nu- 

 merous drawings. 



Several accurate models of ancient buildings, in which both 

 form and aspect had been perfectly imitated by Mr. West, 

 were placed in the library for the evening, and also the model 

 of a conservatory, &c. 



June 2. — Mr. Solly completed his observations on the por- 

 phyry of Christiania, and gave a description of the specimens 

 collected by himself and Professor Esmarck, in illustration of 

 his particular views. 



A peculiarly light rifle, constructed under the direction of 

 Mr. J. H. Leigh, was laid upon the table. 



June 



